# if you get this
sudo apt-get update
Hit:1 http://au.archive.ubuntu.com/ubuntu noble InRelease
Hit:2 http://au.archive.ubuntu.com/ubuntu noble-updates InRelease
Hit:3 http://au.archive.ubuntu.com/ubuntu noble-backports InRelease
Get:4 https://dl.ui.com/unifi/debian stable InRelease [2,292 B]
Hit:5 http://security.ubuntu.com/ubuntu noble-security InRelease
Hit:6 https://repo.mongodb.org/apt/ubuntu noble/mongodb-org/8.0 InRelease
Reading package lists... Done
E: Repository 'https://dl.ui.com/unifi/debian stable InRelease' changed its 'Codename' value from 'unifi-9.0' to 'unifi-9.1'
N: This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for details.
# run this
jm@homepc:~$ sudo apt-get update --allow-releaseinfo-change
Hit:1 http://au.archive.ubuntu.com/ubuntu noble InRelease
Hit:2 http://au.archive.ubuntu.com/ubuntu noble-updates InRelease
Hit:3 http://au.archive.ubuntu.com/ubuntu noble-backports InRelease
Get:4 https://dl.ui.com/unifi/debian stable InRelease [2,292 B]
Get:5 https://dl.ui.com/unifi/debian stable/ubiquiti arm64 Packages [724 B]
Get:6 https://dl.ui.com/unifi/debian stable/ubiquiti amd64 Packages [724 B]
Hit:7 http://security.ubuntu.com/ubuntu noble-security InRelease
Hit:8 https://repo.mongodb.org/apt/ubuntu noble/mongodb-org/8.0 InRelease
Fetched 3,740 B in 2s (2,140 B/s)
Reading package lists... Done
N: Repository 'https://dl.ui.com/unifi/debian stable InRelease' changed its 'Codename' value from 'unifi-9.0' to 'unifi-9.1'